42 Online, non-downloadable software services in the field of real estate; online, non-downloadable software services for advertising and marketing open houses and exhibitions of real estate; online, non-downloadable software services for showcasing real estate, namely non-downloadable services for advertising and marketing open houses hosted by real-estate agents and real-estate brokerages; online, non-downloadable software services for showcasing real estate for use by real-estate agents and brokerages.